167 lines
4.4 KiB
C
167 lines
4.4 KiB
C
/**
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* @file llfasttimer.h
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* @brief Inline implementations of fast timers.
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*
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* $LicenseInfo:firstyear=2004&license=viewerlgpl$
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* Second Life Viewer Source Code
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* Copyright (C) 2010, Linden Research, Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation;
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* version 2.1 of the License only.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*
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* Linden Research, Inc., 945 Battery Street, San Francisco, CA 94111 USA
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* $/LicenseInfo$
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*/
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#ifndef LL_FASTTIMER_H
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#define LL_FASTTIMER_H
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// pull in the actual class definition
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#include "llfasttimer_class.h"
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//
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// Important note: These implementations must be FAST!
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//
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#if LL_WINDOWS
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//
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// Windows implementation of CPU clock
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//
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//
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// NOTE: put back in when we aren't using platform sdk anymore
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//
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// because MS has different signatures for these functions in winnt.h
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// need to rename them to avoid conflicts
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//#define _interlockedbittestandset _renamed_interlockedbittestandset
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//#define _interlockedbittestandreset _renamed_interlockedbittestandreset
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//#include <intrin.h>
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//#undef _interlockedbittestandset
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//#undef _interlockedbittestandreset
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//inline U32 LLFastTimer::getCPUClockCount32()
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//{
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// U64 time_stamp = __rdtsc();
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// return (U32)(time_stamp >> 8);
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//}
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//
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//// return full timer value, *not* shifted by 8 bits
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//inline U64 LLFastTimer::getCPUClockCount64()
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//{
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// return __rdtsc();
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//}
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// shift off lower 8 bits for lower resolution but longer term timing
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// on 1Ghz machine, a 32-bit word will hold ~1000 seconds of timing
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inline U32 LLFastTimer::getCPUClockCount32()
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{
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U32 ret_val;
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__asm
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{
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_emit 0x0f
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_emit 0x31
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shr eax,8
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shl edx,24
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or eax, edx
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mov dword ptr [ret_val], eax
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}
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return ret_val;
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}
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// return full timer value, *not* shifted by 8 bits
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inline U64 LLFastTimer::getCPUClockCount64()
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{
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U64 ret_val;
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__asm
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{
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_emit 0x0f
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_emit 0x31
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mov eax,eax
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mov edx,edx
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mov dword ptr [ret_val+4], edx
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mov dword ptr [ret_val], eax
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}
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return ret_val;
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}
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#endif
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#if (LL_LINUX || LL_SOLARIS) && !(defined(__i386__) || defined(__amd64__))
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//
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// Linux and Solaris implementation of CPU clock - non-x86.
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// This is accurate but SLOW! Only use out of desperation.
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//
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// Try to use the MONOTONIC clock if available, this is a constant time counter
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// with nanosecond resolution (but not necessarily accuracy) and attempts are
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// made to synchronize this value between cores at kernel start. It should not
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// be affected by CPU frequency. If not available use the REALTIME clock, but
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// this may be affected by NTP adjustments or other user activity affecting
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// the system time.
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inline U64 LLFastTimer::getCPUClockCount64()
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{
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struct timespec tp;
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#ifdef CLOCK_MONOTONIC // MONOTONIC supported at build-time?
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if (-1 == clock_gettime(CLOCK_MONOTONIC,&tp)) // if MONOTONIC isn't supported at runtime then ouch, try REALTIME
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#endif
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clock_gettime(CLOCK_REALTIME,&tp);
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return (tp.tv_sec*LLFastTimer::sClockResolution)+tp.tv_nsec;
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}
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inline U32 LLFastTimer::getCPUClockCount32()
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{
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return (U32)(LLFastTimer::getCPUClockCount64() >> 8);
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}
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#endif // (LL_LINUX || LL_SOLARIS) && !(defined(__i386__) || defined(__amd64__))
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#if (LL_LINUX || LL_SOLARIS || LL_DARWIN) && (defined(__i386__) || defined(__amd64__))
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//
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// Mac+Linux+Solaris FAST x86 implementation of CPU clock
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inline U32 LLFastTimer::getCPUClockCount32()
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{
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U64 x;
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__asm__ volatile (".byte 0x0f, 0x31": "=A"(x));
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return (U32)(x >> 8);
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}
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inline U64 LLFastTimer::getCPUClockCount64()
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{
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U64 x;
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__asm__ volatile (".byte 0x0f, 0x31": "=A"(x));
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return x;
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}
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#endif
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#if ( LL_DARWIN && !(defined(__i386__) || defined(__amd64__)))
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//
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// Mac PPC (deprecated) implementation of CPU clock
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//
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// Just use gettimeofday implementation for now
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inline U32 LLFastTimer::getCPUClockCount32()
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{
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return (U32)(get_clock_count()>>8);
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}
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inline U64 LLFastTimer::getCPUClockCount64()
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{
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return get_clock_count();
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}
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#endif
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#endif // LL_LLFASTTIMER_H
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